frostfs-s3-gw/auth/center.go

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package auth
import (
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
"encoding/pem"
"io/ioutil"
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"net/http"
"regexp"
"github.com/klauspost/compress/zstd"
"github.com/nspcc-dev/neofs-api-go/refs"
"github.com/nspcc-dev/neofs-api-go/service"
crypto "github.com/nspcc-dev/neofs-crypto"
"github.com/pkg/errors"
)
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const authorizationFieldPattern = `AWS4-HMAC-SHA256 Credential=(?P<access_key_id>[^/]+)/(?P<date>[^/]+)/(?P<region>[^/]*)/(?P<service>[^/]+)/aws4_request, SignedHeaders=(?P<signed_header_fields>.*), Signature=(?P<v4_signature>.*)`
// Center is a central app's authentication/authorization management unit.
type Center struct {
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submatcher *regexpSubmatcher
zstdEncoder *zstd.Encoder
zstdDecoder *zstd.Decoder
neofsKeys struct {
PrivateKey *ecdsa.PrivateKey
PublicKey *ecdsa.PublicKey
}
ownerID refs.OwnerID
wifString string
userAuthKeys struct {
PrivateKey *rsa.PrivateKey
PublicKey *rsa.PublicKey
}
}
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// NewCenter creates an instance of AuthCenter.
func NewCenter() *Center {
zstdEncoder, _ := zstd.NewWriter(nil)
zstdDecoder, _ := zstd.NewReader(nil)
return &Center{
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submatcher: &regexpSubmatcher{re: regexp.MustCompile(authorizationFieldPattern)},
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zstdEncoder: zstdEncoder,
zstdDecoder: zstdDecoder,
}
}
func (center *Center) SetNeoFSKeys(key *ecdsa.PrivateKey) error {
publicKey := &key.PublicKey
oid, err := refs.NewOwnerID(publicKey)
if err != nil {
return errors.Wrap(err, "failed to get OwnerID")
}
center.neofsKeys.PrivateKey = key
wif, err := crypto.WIFEncode(key)
if err != nil {
return errors.Wrap(err, "failed to get WIF string from given key")
}
center.neofsKeys.PublicKey = publicKey
center.ownerID = oid
center.wifString = wif
return nil
}
func (center *Center) GetNeoFSKeyPrivateKey() *ecdsa.PrivateKey {
return center.neofsKeys.PrivateKey
}
func (center *Center) GetNeoFSKeyPublicKey() *ecdsa.PublicKey {
return center.neofsKeys.PublicKey
}
func (center *Center) GetOwnerID() refs.OwnerID {
return center.ownerID
}
func (center *Center) GetWIFString() string {
return center.wifString
}
func (center *Center) SetUserAuthKeys(key *rsa.PrivateKey) {
center.userAuthKeys.PrivateKey = key
center.userAuthKeys.PublicKey = &key.PublicKey
}
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func (center *Center) packBearerToken(bearerToken *service.BearerTokenMsg) ([]byte, error) {
data, err := bearerToken.Marshal()
if err != nil {
return nil, errors.Wrap(err, "failed to marshal bearer token")
}
encryptedKeyID, err := encrypt(center.userAuthKeys.PublicKey, center.compress(data))
if err != nil {
return nil, errors.Wrap(err, "")
}
return append(sha256Hash(data), encryptedKeyID...), nil
}
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func (center *Center) unpackBearerToken(packedBearerToken []byte) (*service.BearerTokenMsg, error) {
compressedKeyID := packedBearerToken[32:]
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encryptedKeyID, err := center.decompress(compressedKeyID)
if err != nil {
return nil, errors.Wrap(err, "failed to decompress key ID")
}
keyID, err := decrypt(center.userAuthKeys.PrivateKey, encryptedKeyID)
if err != nil {
return nil, errors.Wrap(err, "failed to decrypt key ID")
}
bearerToken := new(service.BearerTokenMsg)
if err := bearerToken.Unmarshal(keyID); err != nil {
return nil, errors.Wrap(err, "failed to unmarshal embedded bearer token")
}
return bearerToken, nil
}
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func (center *Center) AuthenticationPassed(header http.Header) (*service.BearerTokenMsg, error) {
authHeaderField := header["Authorization"]
if len(authHeaderField) != 1 {
return nil, errors.New("wrong length of Authorization header field")
}
sms := center.submatcher.getSubmatches(authHeaderField[0])
if len(sms) != 6 {
return nil, errors.New("bad Authorization header field")
}
akid := sms["access_key_id"]
bt, err := center.unpackBearerToken([]byte(akid))
if err != nil {
return nil, errors.Wrap(err, "failed to unpack bearer token")
}
// v4sig := sms["v4_signature"]
// TODO: Validate V4 signature.
return bt, nil
}
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func (center *Center) compress(data []byte) []byte {
center.zstdEncoder.Reset(nil)
var compressedData []byte
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center.zstdEncoder.EncodeAll(data, compressedData)
return compressedData
}
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func (center *Center) decompress(data []byte) ([]byte, error) {
center.zstdDecoder.Reset(nil)
var decompressedData []byte
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if _, err := center.zstdDecoder.DecodeAll(data, decompressedData); err != nil {
return nil, err
}
return decompressedData, nil
}
func encrypt(key *rsa.PublicKey, data []byte) ([]byte, error) {
return rsa.EncryptOAEP(sha256.New(), rand.Reader, key, data, []byte{})
}
func decrypt(key *rsa.PrivateKey, data []byte) ([]byte, error) {
return rsa.DecryptOAEP(sha256.New(), rand.Reader, key, data, []byte{})
}
func sha256Hash(data []byte) []byte {
hash := sha256.New()
hash.Write(data)
return hash.Sum(nil)
}
func ReadRSAPrivateKeyFromPEMFile(filePath string) (*rsa.PrivateKey, error) {
kbs, err := ioutil.ReadFile(filePath)
if err != nil {
return nil, errors.Wrapf(err, "failed to read file %s", filePath)
}
pemBlock, _ := pem.Decode(kbs)
if pemBlock == nil {
return nil, errors.Errorf("failed to decode PEM data from file %s", filePath)
}
rsaKey, err := x509.ParsePKCS1PrivateKey(pemBlock.Bytes)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse private key bytes from pem data from file %s", filePath)
}
return rsaKey, nil
}
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type regexpSubmatcher struct {
re *regexp.Regexp
}
func (resm *regexpSubmatcher) getSubmatches(target string) map[string]string {
matches := resm.re.FindStringSubmatch(target)
l := len(matches)
submatches := make(map[string]string, l)
for i, name := range resm.re.SubexpNames() {
if i > 0 && i <= l {
submatches[name] = matches[i]
}
}
return submatches
}